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    OlympiadMediumCombinatorics7–9

    How many ways can 5 distinct books be arranged on a shelf?

    De quantas maneiras 5 livros distintos podem ser arranjados numa prateleira?

    Answer options

    Solution

    5!=5×4×3×2×1=1205! = 5 \times 4 \times 3 \times 2 \times 1 = 120.